'Very fast' and 'high stability.' Sounds like trouble... 🙂
Personally, I'm leaning towards getting (yet another) ASUS board when I upgrade in a couple weeks' time, because I have had very good experiences with their mainboards. (I'm waiting for the KT266A boards to have been released for a month or so, then make up my mind which one to get.) Understand that the if you're willing to 'experiment,' you should probably expect to run into trouble with any brand or model mainboard. Also, you should take into consideration that on these forums, you're not going to hear the success stories. There are only few people who dedicate a thread to the fact that their mainboard runs flawlessly. (Many people, myself included, think it's no fun building a computer from the ground up and not getting to solve at least a few problems... 🙂)
Anyway... if you want to avoid the really bad ones (if there are any...), don't buy a mainboard that has just been released and that you know nothing about. Instead, wait for the reviews or personal stories, and find out in particular about the features that you're looking to utilise. The only drawback to that is that by the time you've made up your mind, you hear about another board coming out and you don't want to buy an 'old' one... 🙂